Control board



FIG. 1 is a front view of the control board;

FIG. 2 is a right side view thereof, the left side view being identical;

FIG. 3 is a first variant of the front view of the control board of FIG. 1; and,

FIG. 4 is a second variant of the front view of the control board of FIG. 1. 

CLAIM The ornamental design for a control board, as shown. 